Carburetor - ROCHESTER E2ME 2-Bbl: Description

The Rochester E2ME Dualjet is a 2 barrel, downdraft carburetor. It is used with the Computer Command Control (CCC) system of fuel control. The throttle position sensor sends a variable voltage signal input to the Electronic Control Module (ECM) in response to changes in throttle position. Its signal is used by the ECM to regulate the mixture control solenoid, Electronic Spark Control (EST), Idle Speed Control (ISC) and Torque Converter Clutch (TCC).

An electrically operated mixture control solenoid, mounted in the float bowl, is used to control air/fuel ratio. The plunger in the solenoid is controlled by electric signals received from the ECM.

A mixture control solenoid adjusting screw, to which the solenoid plunger rich limit stop is assembled, controls the solenoid position in the float bowl (lean stop). It also controls the solenoid plunger travel to a fixed limit (rich stop).

An idle air bleed valve, located in the air horn, is adjusted with a gauge. The mixture needles are adjusted on the vehicle for final mixture control.

NOTE: No attempt should be made to set curb idle speed with the Idle Speed Control plunger, as it is controlled by the ECM.

All carburetors are equipped with tamper-resistant features: Factory-cast rich mixture stop bracket, factory-adjusted lean mixture screws, riveted choke coil housings, idle air bleed valves, TPS and idle mixture needles.

CAUTION: NO ATTEMPT should be made to adjust screws except when required by a Computer Command Control System performance check, a major overhaul, or replacement of the air horn, float bowl or throttle body.

All carburetors are equipped with a front vacuum break with a leaf-type bucking spring. Some models may use both a front and rear vacuum break to control choke valve openings during initial engine starting and cold driveaway.